20102451161 has 4 divisors (see below), whose sum is σ = 21648793572. Its totient is φ = 18556108752.

The previous prime is 20102451157. The next prime is 20102451163. The reversal of 20102451161 is 16115420102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9320743936 + 10781707225 = 96544^2 + 103835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102451161 - 2² = 20102451157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102451163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773171186 + ... + 773171211.

It is an arithmetic number, because the mean of its divisors is an integer number (5412198393).

Almost surely, 2^20102451161 is an apocalyptic number.

It is an amenable number.

20102451161 is a deficient number, since it is larger than the sum of its proper divisors (1546342411).

20102451161 is a wasteful number, since it uses less digits than its factorization.

20102451161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546342410.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 20102451161 its reverse (16115420102), we get a palindrome (36217871263).

The spelling of 20102451161 in words is "twenty billion, one hundred two million, four hundred fifty-one thousand, one hundred sixty-one".